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black mamba · January 23, 2012, 03:14 PM

Given that the Speer bullet used in the Alliant data is .0005" smaller (.4295") than the XTP of the same weight, and the listed COAL is a longer 1.665 inches, I would back down to 18 grains of MP-300 to start, using the 1.600" COAL to the cannelure. I, personally, would treat 21 gr. as max with the XTP bullet because of the differences already mentioned.

January 23, 2012, 03:14 PM	#11
black mamba Senior Member Join Date: September 13, 2011 Location: O'Fallon, MO Posts: 476	Given that the Speer bullet used in the Alliant data is .0005" smaller (.4295") than the XTP of the same weight, and the listed COAL is a longer 1.665 inches, I would back down to 18 grains of MP-300 to start, using the 1.600" COAL to the cannelure. I, personally, would treat 21 gr. as max with the XTP bullet because of the differences already mentioned.